Floating point rounding loses cents
An AI agent wrote this JavaScript helper to split a charge evenly across N parties and assert nothing is lost, for a payments feature:
It works for `splitAmount(100, 4)`. Why is this dangerous in production, and what's the right approach?
Implement
split_cents_evenly(total_cents: int, parties: int) → list[int]Examples
in
[10000,4]out[2500,2500,2500,2500]in
[10000,3]out[3334,3333,3333]in
[10,3]out[4,3,3]What a strong answer looks like
Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it (tests, edge cases, reading critically), and how you’d re-prompt or decompose to get it right.
0:00 of about 15 min
Vibe & agentic: describe the solution in plain language (or narrate it) and the coach grades your approach.
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.